Here is a rot13 'walkthrough" of what I did to get to the the 'credits' message (decode per-line if you don't want to reveal subsequent steps) rkgvathvfu pnaqy

Here is a rot13 'walkthrough" of what I did to get to the the 'credits' message (decode per-line if you don't want to reveal subsequent steps) rkgvathvfu pnaqyr rng sbbq trg obar hfr obar ba frjre tengr tb vagb frjre Cneg 2 fgnl fgvyy gjvpr ng yrrpu teno gbepu ba tebhaq hfr gbepu gb trg guvatl sebz fxryyrgba hfr gbepu ba qbbe